hi iam a dialysis patient, and I take renvela , I ve been on it 2 months , and suddenly I can t eat anything without feeling nauseated. I gag like I am going to vomit , but I get dry heeves, I have no pain. and these symptoms are lasting longer and returing even when iam not eating. even smells of food will cause these symptoms. is there something over the counter I can take ,I read antihistamine helps